Flag a) Un carro de ferrocarril de 20,000 Kg, denotado como A, viaja a una rapidez de 30.0 m/s hacia la derecha y golpea a un carro idéntico (igual masa), B, en reposo. Si los carros quedan enganchados como resultado de la colisión, ¿cuál es su rapidez después de la colisión?

b) Calcule la velocidad de retroceso de un rifle de 4.0 Kg que dispara una bala de 0.015 Kg a una rapidez de 600 m/s.

Ahigh-altitude spherical weather balloon expands as it rises, due to the drop in atmospheric pressure. suppose that the radius r increases at the rate of 0.02 inches per second, and that r = 36 inches at time t = 0. determine the equation that models the volume v of the balloon at time t, and find the volume when t = 360 seconds. v(t) = 4π(0.02t)2; 651.44 in3 v(t) = 4π(36 + 0.02t)2; 1,694,397.14 in3 v(t) = four pi times the product of zero point zero two and t to the third power divided by three.; 4,690.37 in3 v(t) = four pi times the quantity of thirty six plus zero point zero two t to the third power divided by three.; 337,706.83 in3